Add filtering of log messages by group

[daniel-thom]

This PR adds a simple solution to the problem where debug log messages from a subject like time series or serialization can overwhelm the log file and you can't debug what you want. Julia already had a solution; we just didn't realize it.

Refer to the changes I made to the time series source file as example usages. If you all like this then I will tag all of the debug messages in IS with appropriate labels.

[codecov[bot]]

Codecov Report

Merging #229 (05fa30f) into master (6b23389) will increase coverage by 0.09%. The diff coverage is 91.04%.

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
+ Coverage   75.14%   75.24%   +0.09%     
==========================================
  Files          43       43              
  Lines        3074     3114      +40     
==========================================
+ Hits         2310     2343      +33     
- Misses        764      771       +7     

Flag	Coverage Δ
unittests	75.24% <91.04%> (+0.09%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/InfrastructureSystems.jl	60.00% <ø> (ø)
src/time_series_storage.jl	77.77% <0.00%> (ø)
src/component.jl	93.58% <75.00%> (ø)
src/serialization.jl	50.49% <80.00%> (ø)
src/hdf5_time_series_storage.jl	93.37% <90.00%> (ø)
src/utils/logging.jl	89.78% <91.76%> (-1.89%)	:arrow_down:
src/components.jl	90.00% <100.00%> (ø)
src/deterministic_single_time_series.jl	75.86% <100.00%> (ø)
src/in_memory_time_series_storage.jl	71.84% <100.00%> (ø)
src/system_data.jl	86.26% <100.00%> (ø)
... and 6 more

[daniel-thom]

This is now more of a complete solution. It shows how tests can use the feature.

[kdheepak]

I didn't know about _group! Neat!

[claytonpbarrows]

One more nit: Is "min_level" the preferred terminology? What about "group_log_level" or "log_group_level"?

[daniel-thom]

One more nit: Is "min_level" the preferred terminology? What about "group_log_level" or "log_group_level"?

I started with set_min_level because group is a parameter name. set_min_group_level is probably better. The first argument has type MultiLogger, so I think log is not necessary.

[daniel-thom]

Here is a summary of changes I made based on today's discussion:

• Changed terminology: set_group_level, set_group_levels
• Create function to create default logging config file.
• Consolidated unit test logging customization to use the logging config file. We will do the same in PSY and PSI.
• Updated the docs.

[daniel-thom]

Is the PSY test break expected?

No. I fixed the bug. Glad we had the cross-package tests.